You've advised the mayor to repair the cracking dam. In 1989, engineers in Austria used waterproof glue and built supporting buttresses to repair the cracking Kolnbrein Dam. Unfortunately, the repairs were very expensive. Luckily, the residents of the big city recognize the importance of the dam and are willing to pay for its repairs. It's a good thing, because the entire city relies on this dam for electrical power. Plus, the dam keeps local farms from flooding during heavy rains. You've made the right choice.